[DOCS] Fix delimited blocks for Asciidoctor migration (#41583)

Author: jrodewig

docs/reference/upgrade/cluster_restart.asciidoc

@@ -39,6 +39,9 @@ include::shut-down-node.asciidoc[]
 +
 --
 include::upgrade-node.asciidoc[]
+--
++
+--
 include::set-paths-tip.asciidoc[]
 --
 

docs/reference/upgrade/upgrade-node.asciidoc

@@ -18,12 +18,10 @@ To upgrade using a zip or compressed tarball:
    data directory. If you are not using an external `data` directory, copy
    your old data directory over to the new installation. +
 +
---
 IMPORTANT: If you use {monitoring}, re-use the data directory when you upgrade
 {es}. Monitoring identifies unique {es} nodes by using the persistent UUID, which
 is stored in the data directory.
 
---
 
 .. Set `path.logs` in `config/elasticsearch.yml` to point to the location
    where you want to store your logs. If you do not specify this setting,